Bryant had 3 national championships under his belt already at Alabama when he had back-to-back seasons of 6-5 and 6-5-1.
Paterno was just two years removed from an undefeated national championship season when Penn State went 5-6 in 1988.
Bobby Bowden had only one season better than 9 wins in his final 9 seasons.
Bud Wilkinson won 13 consecutive conference titles at Oklahoma, then dropped to 3-6-1 and 5-5 in the next two seasons.
Bob Devaney won 4 consecutive conference titles then had back-to-back 6-4 seasons.
Bo Schembechler had won or tied for 10 conference championships at Michigan when he went 6-6 in 1984.
Woody Hayes had two national championships under his belt at Ohio State when he went 3-5-1 in 1959. He had two more national championships to his credit when he went 6-4 in 1971.
These weren't "broken down afterthought" programs. These were legendary, Hall of Fame coaches that struggled even when things should have been humming along following championship runs.